package com.fuliangyun.weather;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.*;
import com.fuliangyun.weather.db.City;
import com.fuliangyun.weather.db.County;
import com.fuliangyun.weather.db.Province;
import com.fuliangyun.weather.utils.HttpUtils;
import com.fuliangyun.weather.utils.Utility;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;
import org.litepal.crud.DataSupport;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * 选择城市
 */
public class ChooseAreaFragment extends Fragment {

    public static final int LEVEL_PROVINCE = 0; //
    public static final int LEVEL_CITY = 1;     //
    public static final int LEVEL_COUNTY = 2;       //

    private ProgressDialog progressDialog;
    private TextView titleText;
    private Button backButton;
    private ListView listView;
    private ArrayAdapter<String> arrayAdapter;
    private List<String> dataList = new ArrayList<>();

    private List<Province> provinceList;    // 省份
    private List<City> cityList;    // 市
    private List<County> countyList;        // 城市

    private Province selectedProvince;      // 选中的省份
    private City selectedCity;      // 选中的市
    private County selectedCounty;      //

    private int currentLevel;       // 当前选中的级别

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.choose_area, container, false);
        titleText = view.findViewById(R.id.title_text);
        backButton = view.findViewById(R.id.back_button);
        listView = view.findViewById(R.id.list_view);

        arrayAdapter = new ArrayAdapter<>(getContext(), android.R.layout.simple_list_item_1, dataList);
        listView.setAdapter(arrayAdapter);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                if (currentLevel == LEVEL_PROVINCE){
                    selectedProvince = provinceList.get(position);
                    queryCities();
                }else if (currentLevel == LEVEL_CITY){
                    selectedCity = cityList.get(position);
                    queryCounties();
                }else if (currentLevel == LEVEL_COUNTY){
                    String weatherId = countyList.get(position).getWeatherId();
                    if (getActivity() instanceof MainActivity){
                        Intent intent = new Intent(getActivity(), WeatherActivity.class);
                        intent.putExtra("weatherId", weatherId);
                        startActivity(intent);
                        getActivity().finish();
                    }else if (getActivity() instanceof WeatherActivity){
                        WeatherActivity activity = (WeatherActivity) getActivity();
                        activity.drawerLayout.closeDrawers();
                        activity.swipeRefreshLayout.setRefreshing(true);
                        activity.requestWeather(weatherId);
                    }
                }
            }
        });

        backButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (currentLevel == LEVEL_COUNTY){
                    queryCities();
                }else if (currentLevel == LEVEL_CITY){
                    queryProvinces();
                }
            }
        });

        queryProvinces();
    }


    /**
     * 查询全国所有的省份，优先从数据库查询，如果数据库没有则从服务器查询
     */
    private void queryProvinces(){
        titleText.setText("中国");
        backButton.setVisibility(View.GONE);
        provinceList = DataSupport.findAll(Province.class); // 从数据库查询所有的省份
        if (provinceList != null && provinceList.size() > 0){
            dataList.clear(); //
            for (Province p: provinceList){
                dataList.add(p.getProvinceName());
            }

            arrayAdapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel = LEVEL_PROVINCE;//
        }else {
            queryFromServer("http://guolin.tech/api/china", "province");
        }
    }

    /**
     * 查询全国所有的省份，优先从数据库查询，如果数据库没有则从服务器查询
     */
    private void queryCities(){
        titleText.setText(selectedProvince.getProvinceName());
        backButton.setVisibility(View.VISIBLE);
        cityList = DataSupport.where("provinceId = ?", String.valueOf(selectedProvince.getId())).find(City.class); // 从数据库查询所有的省份
        if (cityList != null && cityList.size() > 0){
            dataList.clear(); //
            for (City c: cityList){
                dataList.add(c.getCityName());
            }

            arrayAdapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel = LEVEL_CITY;//
        }else {
            int provinceCode = selectedProvince.getProvinceCode();
            queryFromServer("http://guolin.tech/api/china/"+provinceCode, "city");
        }
    }

    /**
     * 查询全国所有的省份，优先从数据库查询，如果数据库没有则从服务器查询
     */
    private void queryCounties(){
        titleText.setText(selectedCity.getCityName());
        backButton.setVisibility(View.VISIBLE);
        countyList = DataSupport.where("cityId = ?", String.valueOf(selectedCity.getId())).find(County.class); // 从数据库查询所有的省份
        if (countyList != null && countyList.size() > 0){
            dataList.clear(); //
            for (County c: countyList){
                dataList.add(c.getCountyName());
            }

            arrayAdapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel = LEVEL_COUNTY;//
        }else {
            int provinceCode = selectedProvince.getProvinceCode();
            int cityCode = selectedCity.getCityCode();
            queryFromServer("http://guolin.tech/api/china/"+provinceCode+"/"+cityCode, "county");
        }
    }

    /**
     * 从服务器获取城市数据
     * @param address
     * @param type
     */
    private void queryFromServer(String address, final String type){
        showProgressDialog();
        HttpUtils.sendOkHttpRequest(address, new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                getActivity().runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        closeProgressDialog();
                        Toast.makeText(getContext(), "加载失败", Toast.LENGTH_LONG).show();
                    }
                });
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String responseText = response.body().string();
                boolean result = false;
                if ("province".equals(type)){
                    result = Utility.handleProvinceResponse(responseText);
                }else if ("city".equals(type)){
                    result = Utility.handleCityResponse(responseText, selectedProvince.getId());
                }else if ("county".equals(type)){
                    result = Utility.handleCountyResponse(responseText, selectedCity.getId());
                }

                if (result){
                    getActivity().runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            closeProgressDialog();
                            if ("province".equals(type)){
                                queryProvinces();
                            }else if ("city".equals(type)){
                                queryCities();
                            }else if ("county".equals(type)){
                                queryCounties();
                            }
                        }
                    });
                }
            }
        });
    }

    /**
     * 显示对话弹框
     */
    private void showProgressDialog(){
        if (progressDialog == null){
            progressDialog = new ProgressDialog(getActivity());
            progressDialog.setMessage("正在加载...");
            progressDialog.setCanceledOnTouchOutside(false); // 不允许点击
        }
        progressDialog.show();
    }

    /**
     * 关闭对话弹框
     */
    private void closeProgressDialog(){
        if (progressDialog != null){
            progressDialog.dismiss();
        }
    }
}
